| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at critical [noun pl] | 22 |
|
| 2 | at critical points | 7 |
|
| 3 | at critical point | 7 |
|
| 4 | at critical moments | 5 |
|
| 5 | at critical [noun sg] | 5 |
|
| 6 | at critical moment | 5 |
|
